Circuit Basics Voltage and How it Works. You’ve probably heard that a battery or a wall outlet has a certain number of volts. This is a measurement of the electrical potential produced by the battery, or the utility grid connected to the wall outlet.
Identifying a capacitor in a circuit in the 1950s was easy. Circuits were made of only a few different kinds of components, and capacitors were clearly marked. Today, not only are there many more kinds of parts on a printed circuit (PC) board, they also may be hard to tell from one another.
Well this circuit is almost the same thing in basic electronics. Take a look at the circuit to the left. It's a simple series circuit with a battery, resistor and L.E.D. (light emitting diode) all in series. The ground wire or common makes the circuit complete. Here are some typical values for the series current limiting resistor.
Some resistors are made up of just that. A long wire. But you can also find resistors made of other types of materials. Like this carbon film resistor: What Does The Resistor Do To My Circuit? The resistor is a passive device and doesn’t do anything actively to your circuit. It’s actually a pretty boring device.
However, in the single sided boards one side is reserved for the copper trace and the other side houses the components. On top of the copper layer sits the solder mask and the silkscreen. The solder mask is what makes the PCB its recognisable green colour.